Come and listen to the temperature sensor manufacturer engineers about the working principle and characteristics of digital temperature sensor

Digital temperature sensor conductor is bridge road, after all, power supply, signal output, long term excitation voltage compensation channels. Plating silver wire must be better than copper wire, copper wire must be better than aluminium wire, its role is self-evident. With the increase of various kinds of high frequency and radio interference, good shielding of temperature sensor and is an important method of protection signal stability. Next, listen to the opinions of the temperature sensor manufacturer's engineer. Firstly adjust damping to zero state, first adjust the zero point, and then fill pressure adjusting range, the output is 0 mA. This paper introduces how to quickly adjust the zero and span. Zero adjustment of fullness, but more influence on the fullness. If there is no deviation, the effect is about 1/5 of the range adjustment, namely the range adjusted upward 1 ma and the zero point upward moves about ma, and vice versa. It is not feasible to use the traditional calibration method of intelligent sensor, because it is decided by the structure and principles of HART sensor. In the smart sensor input pressure source and produce 4 - Between 0 ma current signal, in addition to the mechanical and electric circuit, and a microprocessor chip to calculate the input data. Therefore, adjustment method is different from the traditional method. First of all, the inside of sensor for 4 - D/A converter 0 mA fine-tuning. Because it does not involve the use of sensor components, so does not require an external pressure source. For display instrument, digital temperature sensor needs to be measured parameters necessary calculation, processing and nonlinear compensation, and to compensate the influence of other parameters to be measured. In A acuities were D transformation, adoption of A certain unit of measure to quantify the analog of continuous change, get an approximation of continuous digital quantity. Measurement unit is smaller, the smaller integer quantization error, the frequency response of A D or less converter is higher, the higher the stability of the preamplifier, the closer the digital quality continuous quantify the value of itself. The process by the double integral type, voltage frequency, pulse width modulation, continuous voltage feedback encoding type, etc. Nonlinear compensation or scale transform is the essential means to detect the signal, the digital display instrument measured parameters can be directly used to say. Simulation of the nonlinear compensation by changing the operational amplifier amplification coefficient for different range of input voltage. Digital nonlinear compensation first through A D or less measured parameters of the simulation value is converted to A digital value, and then into the nonlinear compensation link. 1. In order to make the thermal resistance measurement and fully exchange heat measured medium, should reasonably select the position of measurement point, in order to avoid the valve, elbow, pipe and equipment near the corner of install thermal resistance. 2. The second step. With case the thermal resistance of heat transfer and heat loss. In order to reduce the measurement error, thermocouple and thermal resistance should have enough: (insert depth 1) Measurement of pipeline fluid temperature at the centre of the thermal resistance, the measurement should be generally inserted into the pipe center ( Vertical or inclined installation) 。 If the measurement of fluid pipe diameter is 200 mm, inserted depth of the thermal resistance should be 100 mm. ( 2) In high temperature and high pressure, high velocity ( Such as main steam temperature) Temperature measurement, in order to reduce the protection casing resistance to flow and prevent protect casing under the action of fluid, broken, can insert the protection or protection casing pipe leeks with heat sleeve thermal resistance and thermal resistance in the case of shallow socket. Protective sleeve insertion depth should not be less than 75 mm. 100 mm; （ 3) If you want to measure the smoke of the flue temperature, although the flue is 4 meters in diameter, but the thermal resistance insertion depth of 1 m. （ 4) When measuring the original component insertion depth of more than 1 m, should be installed vertically, as far as possible or install racks and cases. Digital temperature sensor manufacturers finally has carried on the comprehensive fine-tuning to network of engineers, 4 - 0 m digital readout and the actual application of pressure signal to match, so you need to fully monitor wireless pressure signal source of self-assembly, through adjustment, the analog output of 4 - 0 ma and application of pressure signal source, its role and zero adjustment, z） Identical, and the shell sensors ( Low power) Have been adjusted, Low power) 。

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